For some reason, this ink was incredibly difficult to photograph and get accurate color reproduction. Some of these pictures make the ink look purplish blue-black, but it's really just a very deep purple, which shows more if you are using a broader nib. Of course, here I'm using a Japanese XF, so I've probably caused the issue myself, but oh well.
Sailor apparently has replaced the old Jentle Ultramarine with two purple options: Nioi-Sumire, which is a personal favorite of mine and leans heavily to the blue end of the spectrum with purple undertones, and Shigure, which is a deep purple. I'm not going to bore you with a discussion of the ink properties other than to say that I've found all of these new Sailor inks to be nearly identical in that regard (read: quick drying, no-bleeding, no-feathering, and overall excellent). Next up will be Oku-Yama (the "new" Grenade).